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Excavation and quarrying operations shall not disturb the <br /> existing watercourse and wetland habitats and shall not occur <br /> within 100 feet from the centerline of the natural drainage <br /> channel. <br /> Additional surveys for the following flowering sensitive plant <br /> species shall be conducted as described: <br /> 1) Surveys shall be conducted for Delta button celery during <br /> the period August - October. <br /> 2) Surveys shall be conducted for Greene's tuctoria during <br /> the period May - June. <br /> 3) Surveys shall be conducted for Ahart's dwarf rush during <br /> the month of April. <br /> Should evidence of any of these species be found, the <br /> California Department of Fish and Game and the San Joaquin <br /> County Planning Department shall be notified. <br /> The Corps should be contacted to provide a determination of <br /> their jurisdiction regarding the narrow relatively flat <br /> drainage swales without distinct bed or bank cutting which <br /> transport surface flow from the southeast portion of the <br /> project site. The Corps may be reached at 916-551-2526. <br /> Excavation and quarrying operations shall not disturb the <br /> vernal pools in the far southeastern portion of the project <br /> site, as shown on the Biological Resources Map. <br /> Additional surveys for the California tiger salamander shall <br /> be conducted in May or late fall 1991 to verify the presence <br /> or absence of this creature. <br /> 1.4 .5 Noise <br /> The proposed project expansion will have no adverse impacts upon <br /> existing noise levels. No potentially significant impacts upon or <br /> irreversible environmental changes will result from noise impacts. <br /> Insignificant impacts that could occur include: <br /> Although field measurements of noise emissions produced by <br /> backup horns on mobile equipment are barely perceptible and <br /> not quantifiable, this noise is potentially very annoying. <br /> I� This impact will be minimized to a level of insignificance by <br /> specific mitigation measures including: <br /> El Rancho Rock and Sand, Inc. will institute and enforce a <br /> written policy to minimize the annoyance of this noise. To the <br /> extent practicable, the excavation and processing operations <br /> will be reconfigured to minimize the necessity of backup of <br /> equipment. Mobile equipment shall not be left in reverse gear <br /> 5 <br /> CONDOR <br />